It is not just you: StumbleUpon is down
If you are looking to discover something on StumbleUpon this morning, it looks like you may have to wait since it is currently down due to technical difficulties, what they are we are unsure of but wonder if it may be yet another update.
You exploring the web to like or dislike will have to be put on hold since it is down and no, you are not the only one experience this issue. Hopefully it will be back up and performing normally very soon. Until then, there is always Reddit.