Zenobia's comment makes me ask this question which is slightly off topic: When employers hire open source talent, and they're vetting applicants, how closely d

Zenobia's comment makes me ask this question which is slightly off topic: When employers hire open source talent, and they're vetting applicants, how closely do they look at say, for a lack of a better word, an applicant's online footprint? Are they concerned if the applicant is active in specific organizations, forums, etc. If yes, which ones?