After I comment on a blog and when I click Submit, the same page refreshes and my comment is also not displayed in Comments box.. Also There is no message like Comment is under moderation bla bla.. IS this normal, I have seen this on more than 50 blogs I guess.
If you were commenting on WP blogs, and assuming there is no "your comment is awaiting moderation" message, most probably you were flagged as a spammer. The blogger might manually approve your comment and unblock you, but the best way to solve this is to contact Akismet and explain yourself. I got blocked a couple of times before myself.
I think the comments you have posted must be waiting for blog owner's approval.In every blog the owner have an option whether to directly allow the comments to get posted or it has to wait for his approval.
I think it's normal. Why don't you check the blogs you've commented on a couple of days later? Go Celtics!
There is some blog software that doesn't do a full refresh when you submit. Right click the page and hit refresh
This is perfectly normal. This is the message you get from wordpress blogs when the blog owner either moderates all comments before they are published, or they moderate comments from posters who haven't commented before. It doesn't mean your comment was flagged as spam, but if it was a spammy comment, I would hardly expect it to get through. In general, I believe that if you are attempting to add value to the conversation, you don't have much to worry about, even if you are using keyword-stuffed anchor text.