The best alternatives to WeKiki are Tribe, BlabRoulette, and Tiny Talk. If these 3 options don't work for you, we've listed a few more alternatives below.
As some of you may have noticed, Tribe shifted from asynchronous to synchronous messaging 2 months ago using fully in-house technology. Since then, the team has been heads down polishing this first prototype.
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Tiny Talk is bringing back social serendipity through randomly coordinated 7-minute 1:1 video chats amongst friends -- it's like ChatRoulette, but with your friends.
Interesting Chat lets you have 1-on-1 audio conversations with random strangers based on topics you're both interested in. Search through millions of interests and select them to start a conversation.