Ssocial bookmarking really work as backlinks ?

Question

Do they really can be taken as backlinks ? Does Google take those links as backlinks ?

Answer 1

Social bookmarking links such as the ones you might find on facebook might be a backlink in nature, but they won't count towards your backlink count because facebook is internal in a sense, unlike myspace, where profiles can be seen by anyone.

Answer 2

If the link holds a follow atribute then it's a valid backlink.