I've been working in BPO industry for almost 10 years now. And in that span of time I've experience many different types of link building techniques. I've experienced doing some link exchange, profile linking, blog commenting but I have more experience doing some text link placement where we contact various webmasters to place a sentence to their post for a desired amount .
Onlinejobs.ph "ID Proof" indicates if "they are who they say they are".
It DOES NOT indicate skill level.
ID Proof scores are 0 - 99 with 99 being the best. It is calculated based on dozens of data points.
It's intended to help employers know who they're talking to is real, and not a fake identity.