Anyone know why all apps in play store done have a +1 button?

I was going to +1 an app but it didn't have a +1 button so after looking at different apps I noticed some do & some don't have the button.
...Just something I noticed, thought maybe someone might know why or maybe it's a bug.

Show Accepted Answer

Guest Quick Reply (No URL, BBcode or HTML)

Last post by xrowe
1 hour ago
Last post by bernice.koch
40 minutes ago
Last post by assunta67
1 hour ago
Last post by mclaughlin.kobe
2 hours ago
Zedge help
Started by samara58
Last post by marcelina.auer
3 hours ago