Having a presence on SM is critical if you're in a phase of your career where you will benefit from being "discovered" by recruiters. Those tools help recruiters and sales people scale. But more importantly having a presence on SM does not require a privacy sacrifice. The sacrifice comes from a thousand microchoices in what you share. Follow 4 steps to get the primary benefit:
1. Sign up.
2. Post a CV/resume.
3. Configure notifications to push email or SMS.
4. Then log out
If you don't "claim" your online identity, you risk having it claimed by someone else.