What to do in Facebook Group? Help me pls

I am really very confused to see this type of message.

When I join any group and try to post my website link/ url . I saw this message most of the time -

"Warning: This Message Contains Blocked Content
Some content in this message has been reported as abusive by Facebook users."

Don't know why I see these type of message........ Please tell me how I will solve my problem and how i will post my link in group........ - Help me pls.

there are some threads already about this in facebook section

Stzzzz said:

there are some threads already about this in facebook section

Click to expand...

Please give me the link dear and solve my problem.

I replied to u in PM and in the other thread