If a person sees the Kosel on a web cam – would this patur him from doing kriyah when actually visiting the Kosel.
Answer:
No, seeing the kosel on a web cam does not exempt a person from keriah, any more than a picture of the kosel.
The obligation of keriah applies only to somebody who actually sees the kosel (and not to somebody who sees a picture or video — even live), and in the same sense, the exemption from keriah applies only to somebody who was actually at the kosel within the last 30 days.