Complex sentence: In social network services such as Twitter, a caret placed before a word is used to tag that word as an individual's signature within a group account thus differentiating an individual's contribution from a group-authored contribution.
Split into simpler sentences: In social network services such as Twitter, a caret placed before a word is used to tag that word as an individual's signature within a group account. This differentiates an individual's contribution from a group-authored contribution.