Slideboom as a service is excellent but unfortunately the embed code that provided is not in <iframe ... So it must be modified in order the new Twinspace accept it. Look at this step by step guide how to do this.

1. How to embed a ppt in a Twinspace page using the free service slideboom
Do you have documents that you want to appear on the pages of Twinspace? It's a very easy process that is completed in just 4 steps, sufficient to find a service to upload them and to provide the relevant embed code. Such services are many, such as the slideshare, where you can upload powerpoint presentations and word sheets, the slideboom (for powerpoint presentations) which allows transfers and special effects of presentations (but unfortunately the code that provides must be modified like with a process equivalent to Voki) and the service ONE DRIVE of Microsoft (for documents of word, powerpoint presentations, excel sheets) which , with a free registration, provides an entire office suite and related embed code and moreover the function to edit these documents through the twispace page . For the needs of this tutorial will be used the slideboom service in which the embed code should be modified as all the embed codes from those services which do not offer <iframe ... code
Step 1
After uploading the presentation on slideboom get the embed code.
Step 2
Open the page that you will embed the presentation, in html mode.

2. Step 3
Paste the embed code from the slideboom, which will look like this:
<div style="width:425px;text-align:left"><a style="font:14px Helvetica,Arial,Sans-serif;color: #0000CC;display:block;margin:12px 0 3px 0;text-decoration:underline;" href="//www.slideboom.com/presentations/814557/Greek-Museum" title="Greek Museum">Greek Museum</a><object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://fpdownload.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,28,0" width="425" height="370" id="onlinePlayer814557"><param name="movie" value="//www.slideboom.com/player/player.swf?id_resource=814557" /><param name="allowScriptAccess" value="always" /><param name="quality" value="high" /><param name="bgcolor" value="#ffffff" /><param name="allowFullScreen" value="true" /><param name="flashVars" value="" /><embed src="//www.slideboom.com/player/player.swf?id_resource=814557" width="425" height="370" name="onlinePlayer814557" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer"allowScriptAccess="always" quality="high" bgcolor="#ffffff" allowFullScreen="true" flashVars="" ></embed></object><div style="font-size:11px;font- family:tahoma,arial;height:26px;padding-top:2px;">View <a href="" style="color: #0000CC;">more presentations</a> or <a href="/upload" style="color: #0000CC;">Upload</a> your own.</div></div>
From all this code you only need the red piece which is in parentheses with the word embed. Delete all other code sections which is useless so as to stay only the following:
<embed src="//www.slideboom.com/player/player.swf?id_resource=814557" width="425" height="370" name="onlinePlayer814557" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer"allowScriptAccess="always" quality="high" bgcolor="#ffffff" allowFullScreen="true" flashVars="" ></embed>
Replace everywhere the word embed with the word iframe and the code should looks like that:
<iframe src="//www.slideboom.com/player/player.swf?id_resource=814557" width="425" height="370" name="onlinePlayer814557" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer"allowScriptAccess="always" quality="high" bgcolor="#ffffff" allowFullScreen="true" flashVars="" ></iframe>

3. Step 4
Close the html edit mode and, if all went well, your presentation is embedded in the page, press save and you're ready.
Good luck
Petros Michailidis
eTwinning Ambassador for the region of
East Macedonia & Thrace - GREECE