Does anyone find this annoying or am i just over reacting?

Basically I have a friend named Maggie who is probably better friends w/ my other friend Rebbecca. literally every time i post a message on rebecca's facebook wall maggie always finds said message and comments on the message interfering w/ our (rebbecca and mine) conversation. after maggie comments, Rebbecca always ends up stopping sending comments back to me and i never get the chance to have a complete one on one conversation w/ Rebbecca w/ out maggie interfering. i'm aware that maggie and Rebbecca probably have a better relationship together than Rebbecca and i, and i know maggie has a right to comment on who ever's post she likes but would you find it annoying that you never can have a one on one conversation w/ a friend without another friend always breaking your original conversation up? don't i have the right to converse with someone without constant interruptions from others and others stealing my conversation?