What do you call it when Mark adds a comment to your post?

What do you call it when Mark adds a comment to your post?

To The People Offended By Mark's Sass

Markiplier

Catastrophesavvy: Well This Is My First Stab At A Realistic Drawing Of @Markiplier… At First I Hated It But After Shading I Decided It Wasn’t That Bad For A First Try! ^-^ Hot Damn I&Amp;Rsquo;M A Sexy Bitch

Markiplier

Ameiluu: When Your Fans Ship You But You’re Just Brosfeat. @Markiplier And @Therealjacksepticeye And Me Being A Dweeb X Seems About Right

Stephanieofrp: Love U Mom… Teh Fook&Amp;Rsquo;S Wrong With My Name? I Admit Those Other Dbag&Amp;Rsquo;S Have Weird As Names But Mine Is Respectable And Can Be Traced Back Generations!

Mog-The-Doctor: @Markiplier Can You Please Explain To Me What This Is That I Found On The Internet? @Shuploc What Do You Have To Say For Yourself?

Markiplier

Markiplier

Markiplier

Markiplier

Markiplier

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