I use an add-on that save incoming search words queries by incoming users to my forum Is this against SEO terms and this may have effect on the new google Hummingbird update??
I tried to research a lot regarding your query but I did not find any eye catching results so i don't think Google frowns upon this technique. How long have you been using this plugin? if your website is not affected by the hummingbird update till now, chances are it'll never affect... hope this helps.
Unfortunately my website has been affected by hummingbird update! I've been using this plugin over last 3 years! so this plugins is against Google and consider a black hat SEO technique?
I wouldn't call it blackhat but it isn;t whitehat either. Is there any real change in usability with keyword cloud? i guess no, so search engines may not really like it.