It's definitely on purpose. They've done the same with "Likes". I've been trying to unlike all the dumb pages I liked when in high school ("When you flip your pillow to get to the cold side ;]", "Brock Obama", "texting late at night", "peeling plastic off of new electronics", etc...) and once I got my 2k likes down to about 300ish, they stopped showing me my likes when I look at my profile. It literally says "326 likes" on the tab itself but it's just not populated with anything. Every once in a while, a defunct page will post again and I'll have the opportunity to unlike "Tiger Blood", but the infrequency kills me.

Just wish I could firewall <22 year old roninb from >22 year old roninb.