...there are squirrels in my head...

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(Too funny to resist answering.)

I don't 'keep tabs' on anyone online.

I have, in the past. Most of the time, it's been focused at estranged family members rather than love interests, and...I think that to look for information about people that don't care to have you in their lives is ultimately hurtful towards Self and often led into some sad thoughts, so I rarely do so anymore.

I have online connections to several exes. It's not 'keeping tabs,' it's 'staying friends.'
I also have severed online connections with a few people that were once important to me. I'm pretty thorough about such things - emails get filtered to 'trash,' social networking site accounts get blocked, etc. My general thought is that if you are someone that is not in my life, I'd prefer to keep it that way. And just as I'd not invite you into my home, I'd prefer you stay out of my electronic life...and will reciprocate that 'favour.'

So - yeah. I think it's emotionally unhealthy to maintain a 'stalker' sort of contact with an ex-whatever.