Is it alright to comment on a public wall post on someone else's FB page?

[Paul]

You must realize that people can turn against you and cause damage to your computer by sending viruses. Just ignore what they're doing or saying and move on. Look at this (click on this)
http://www.google.com and when the blank line comes up, type a word, a phrase, a question and hit enter. For example, type the word malware . And click on the numbers at the bottom of the page. Be careful!! Hope this helps, Paul.