It would be great to have a facebook-like auto expanding textbox with character counter.
I was just looking for something simple like this http://www.jacklmoore.com/autosize/ a property that when enabled would autosize the radtextbox. Using a RadEditor would be overkill, especially on larger forms when multiple are needed.
The requested functionality is supported by RadEditor. You can obtain its content as text through the Text server property. The editor also offers a character counter and can be displayed as a textbox as shown in this demo: http://demos.telerik.com/aspnet-ajax/editor/examples/editorastextbox/defaultcs.aspx. You can enable the auto height resize feature by setting AutoResizeHeight="true" as shown at http://demos.telerik.com/aspnet-ajax/editor/examples/autoresizeheight/defaultcs.aspx.