Sometimes I modify my message due to poor proof reading. Is it necessity for everyone else to see that I modified my post?

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There is a purpose to that: in interesting or heated threads, someone who posts something asinine/juicy/etc can go back & change what they wrote, & then the responses make no sense. The "modified" gives later readers a hint that possibly they are not reading the original juicy post.

However, some boards have a window of free modification, usually 5-10 mins, where you can go back and correct grammar or spelling errors without the modified message showing.  That's a nice, user-friendly feature to have.

for the reasons kerri mentioned.  

Other forum software options offer PREVIEW options (preview, save as draft, ...).  

TER Forum software is not so good for what the forums have become.  A discussion of other forum software options came up recently in S&P: "Message Size of each post. link - by impposter, 11/29/2015 3:51:31 PM"   Edit: I AGREE that it's kind of annoying and distracting, but there needs to be some kind of notice of a change once it has been read by even one person.

-- Modified on 12/20/2015 10:59:50 PM