Disadvantages of Using Nicknames

I saw many people using nick names in Friends networking site like orkut. The nickname which contains special characters, ex: -=|yäÞÞä|=-, ,.-~*´¨¯¨`*·~-.¸-(_yappa]_)-,.-~*´¨¯¨`*·~-.¸.
Think why you have a profile at Orkut??? To get connected with new friends & search for old friends. Nick Names does’t affect much on first one “connected with new friends”,but will affect the second one.If any of your old friend searches for you at orkut, He/She will not found you since you kept a nickname which has special characters.
Suggestions for Putting name at Orkut:
Put a name which is very unique to you.I have kept “Prashanth” as first name & “HN” as last name.If anyone searches for prashanth hn or hn prashanth at orkut will get only 2-3 results.Then they could find me easily with the help of photo.