Slack Markdown for Links Are Not Resolving

Slack currently does not support hyperlinks; see this link which says:

Note: It’s not possible to hyperlink words in a Slack message.

UPDATE:

Slack has finally added this functionality to their chat interface (source):

• Select text, then click the link icon in the formatting toolbar
• Select text, then press Cmd+Shift+U on Mac or Ctrl+Shift+U on Windows/Linux.

Copy the link you'd like to share and paste it in the empty field under Link, then click Save.

Slack uses their own flavor of markdown:
Slack Markdown Links work in the following way: <http://someurl|like this>

Note: You can only do this via the Slack API and NOT just as a simple message you send via the Slack client.

Message Builder Example
More Info in the Docs

This is not yet supported by Slack for direct messages, you can only do this using Slack API. But you can upvote the feature request I have submitted here.