Blog >Wiki Block > Paragraph with links copied & pasted to a wiki block. View mode is shown differently.Refer screenshot.

Blog >Wiki Block > Click Add an Entry button.

Copy a paragraph having some links & paste in the Wiki block and click Save. ( for example, http://en.wikipedia.org/wiki/Software_testing .From this link copy paste some paragraph and paste in the wiki block)

Then in the View mode, it is noted that the whole content color changes to blue & the word having link is now shown as "?" .
Also all the words are shown underlined. Even Save Comment/Cancel comment buttons are shown underlined.