Do links from social media/networking websites (Facebook, Linkedin, Youtube) help

[SaraGirlNY]

increase your pagerank? I work for a small electronics company and am wondering if building a group page on LinkedIn would help our search engine optimization? When someone joins your group, does the link to your site on their page help increase your number of inbound links?

[SportTonight]

Why not? if back link born natural and no spam...Back to humanWhen you like someone you will suggest or refer him to your friends.Same SameWhen other site link to your sites that they like your site.Therefore What your have for refer?????