1. The Profile belong to a Person or something else. If not a person who you can make due diligence upon, discard
2. Does the Profile has a Picture of a Human Being?
3. Check Number of 1º Degree Connections
4. Does the Jobs Trajectory of the Person makes sense?
5. Does College Education makes sense? Currently I am seeing one from India with the name a High School College from Venezuela, even using spanish. Does that make sense?
6. His Public Emails is senseless and does not refere to any person.

Don´t be foolish, always ask referrals. Do give away your data so easily.