Some of my favorites:
Don’t be phony! Be yourself — it’s what your social network friends added you for. There are, of course, many ways to “game” just about every social media system, to get more diggs, to appear to have more followers, to get your posts Stumbled, and so on. But in the end, it’s an empty gain — people who follow you because you appear to be something you’re not will quickly un-follow you, people who end up at your site because you managed to get more votes on a post than you deserve will leave without reading, and all you’ll have is an empty number to show off.
Signing up for social networking sites and social news sites is easy, but unless you’re willing to put in some work, you won’t get much out of it. You need to keep your profile reasonably up-to-date, maintain at least a marginally active presence, and talk to other people now and again to make it work. If you have a hundred different profiles on a hundred different sites, you’ll soon get overwhelmed and none of them will get the attention they need to thrive. Pick a handful of services and sites to put a lot of energy into — or however many you have time to really commit to — and stay off the rest.
That said, don’t participate in too few sites, either. First of all, if you slip up and damage your reputation at one, you’ll have to start from scratch somewhere else. But more importantly, different sites have different strengths. LinkedIn is best for professional advance, MySpace for broadcasting your interests and creative work; Digg is traditionally better suited to news, especially technology and weird stuff, StumbleUpon to smaller niches.
I can’t say enough about finding the right fit with whatever network you choose and utilizing that one with the tips included above. My favorite is still Flickr. The level of feedback, participation and discovery I have there works well for me. Twitter worked well during summer break as I played around with location aware services and shared silly happenings.
What would you add to the list?