Ok, for those who read this and want to get back to the first page and still there is no button for it:
post something and it will navigate you to the first page, then delete your post
or,
refresh the fucking page
or,
click on Home on the top
BTW, the least I expect from a social wall like this is being able to easily navigate between pages. It is not even possible to go to first page quickly, after going to older ones.
I don't think adding this feature would be very hard, or time-consuming.