Just came across this link on twitter today
"@Elle_Gifted Alternative to Wallwisher for primary sts shared by @plnaugle http://primarywall.com/ at Tech Smackdown #RSCON3."
Primary Wall looks like a great alternative to Wallwisher especially as it seems to be 'broken' quite often. It has a few different features from Wallwisher and is very easy to use.
Here is an example of what it looks like
And you can choose to send your notes to Wordle
And here is a list of ideas you could use Primary Wall and Wall Wisher for...