So some forum signature links(like sitepoint) are dofollow. I was wondering if they could hurt your google SEO by being counted as webspam. There are a few forums that I’ve been part of forever that are dofollow(most are no follow). The site I’m talking about is the public domain photo site(in my signature). In google webmaster tools, it says there are no issues. And when I check for manual webspam, it says “no manual webspam detected”. I do have a lot of inbound links for a few forum sigs like Sitepoint where I’ve been a member forever but also some links for web design blogs which blogged about my photography site as a resource. However, when I search for “goodfreephotos”(without spaces), my FB page comes up first and then at the end of the first page, comes some sub-pages of my site. It seems that google can find my subpages but cannot find my homepage, no matter what. I do not get why this is. All inbound comes from resources and blogs and everything else, point to my frontpage. So do do-follow forum link hurt your SEO?
Surely, it won’t , actually in the opposite it will help you to increase the page rank. You will get more traffic to your website
I’m a bit worried that forum sig links will be counted as “spam links”, although I don’t think they will.
All external links on SitePoint are nofollow - and that includes signature links.
Ok, I see now, but there are other forums that are do-follow. The question still remains if those links hurt SEO.
I’m guessing you mean “links that are not nofollow” ? 
Anyway, I don’t think your homepage is being penalized, but remember that Google wants to provide the best search results it can.
So consider
Compared to your Facebook page, (#1 result) how often is the homepage updated and how much actual text content does it have?
Then coming in at #9 and #10
In what ways do these pages differ from the homepage?
My homepage is updated a lot more often than the FB page. It gets updated every time I upload new photos. maybe there isn’t enough text on it though. But other sites that ranked highly(photo sites) in my niche usually don’t have much text either. I’m trying to change my site structure a bit to leverage the homepage here. If you search for goodfreephotos.com then the homepage comes up first, so its weird.
Bing and Yahoo have no problem with the homepage, its only google.
That’s not a realistic or relevant test (unless you think goodfreephotos is a search term your potential visitors will actually use).
I have a domain called (using an example name, but the test is real) hebrideanrailways.com. If I search for the business name, Hebridean Railways, it comes up first in the results (with multiple pages shown), along with the associated Google + page. Other results are articles about the business, or linking to the business. If I use hebrideanrailways as the search term, my home page still appears first, but no Google + page, and the rest of the results are pretty useless - sites showing domain rankings and suchlike. Why? Because in both cases Google is showing results about my search term, but in the second instance, that term only exists in the domain name.
Google is smart. I’d be willing to bet that it can tell the difference between a signature on a legitimate forum or blog-type site and spam. You have to try quite hard to get inbound links that actively hurt your SEO, because they are wary about allowing unscrupulous types to damage other people’s sites and so don’t want to make it easy for people to plant a few bad links to their competitiors’ sites and rise to the top as everyone around them gets penalised.
My take on this is that it really would depend on the quality of the forum sites you are building your links from. You have to be wise in choosing these websites. Poor, low-quality, and spam forums should not be targeted. If you do so, there’s a great change you’d be penalize by Google. IMO, quality forum sites usually moderate the approval for new users. Others would not allow new users to have signatures until they’ve done what the forums require. When you find forums like these, you’d know they want real members who can engage into real conversation with others and not just spread signature links all over their sites. IMO, that’s a way of figuring out if a forum is a good one.
to be realistic here, as long as you not overdo and do things with your brain turned on, it’s very possible that you’ll be fine with such signatures