XF 2.2 How to allow guest users to allow "Like" feature

[sajal]

We are using XFv2.2.6.

Is there any permission from admin which enables "like" feature for guests users? If not, any plugin or something similar?

Thanks in advance!

 

[Chromaniac]

wouldn't it also result in search engine bots hitting all the likes on every post every time they index the page?